This is one of those mysterious book that keep you sucked in from the very first word of the page. I love mysterious. But what I loved the most about it, is being able to follow along a trail of secrets, dark pasts and murders.Imagine you finding out that the life you been living is the lie. Your parents are not your parents and nobody knows who you are. Chap feeling bemused by all of this decided to continue living the lie he already lived. I mean,whats the point? You've been living a lie this entire time, why not live it some more? I really loved the plot of this book. To be in Chap shoes and to feel his feelings was amazing. I enjoyed seeing things different through Chaps eyes. I like seeing him play the role of Cassiel. As the reader, it so easy to follow Chap. The author makes it easy to not only see Chap but feel his emotions.The greatest part of this book is the mysterious unraveling before the reader. Every page turn left me so anxious just to figure out the mystery. I could do nothing but read the book faster just to get next page. Double, is the kind of book that has a fresh, invigorating spin on story. This book I could read over and over again!My verdict, read it! Non-stop action and mystery from page one will leave you breathless!